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                    第1章 你好，并发世界
            
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                    1.1 何谓并发
            
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                    第2章 线程管理
            
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                    2.1 线程的基本操作
            
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                    2.2 传递参数
            
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                    2.3 转移所有权
            
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                    2.4 确定线程数量
            
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                    2.5 线程标识
            
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                    2.6 本章总结
            
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                    第3章 共享数据
            
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                    3.1 共享数据的问题
            
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                    3.2 使用互斥量
            
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                    3.3 保护共享数据的方式
            
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                    3.4 本章总结
            
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                    第4章 同步操作
            
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                    4.1 等待事件或条件
            
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                    4.2 使用future
            
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                    4.3 限时等待
            
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                    4.4 简化代码
            
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                    4.5 本章总结
            
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                    第5章 内存模型和原子操作
            
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                    5.1 内存模型
            
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                    5.2 原子操作和原子类型
            
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                    5.3 同步操作和强制排序
            
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                    5.4 本章总结
            
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                    第6章 设计基于锁的并发数据结构
            
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                    6.1 并发设计的意义
            
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                    6.2 基于锁的并发数据结构
            
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                    6.3 设计更加复杂的数据结构
            
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                    6.4 本章总结
            
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        <li class="chapter " data-level="1.14" data-path="../chapter7/7.0-chinese.html">
            
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                    第7章 设计无锁的并发数据结构
            
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        <li class="chapter " data-level="1.14.1" data-path="../chapter7/7.1-chinese.html">
            
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                    7.1 定义和意义
            
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                    7.2 无锁数据结构的例子
            
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                    7.3 设计无锁数据结构的指导建议
            
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                    7.4 本章总结
            
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        <li class="chapter " data-level="1.15" data-path="../chapter8/8.0-chinese.html">
            
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                    第8章 并发设计
            
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                    8.1 线程间划分工作
            
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                    8.2 并发代码的性能
            
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        <li class="chapter " data-level="1.15.3" data-path="../chapter8/8.3-chinese.html">
            
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                    8.3 为多线程性能设计数据结构
            
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                    8.4 设计并发代码的注意事项
            
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                    8.5 在实践中设计并发代码
            
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                    8.6 本章总结
            
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                    第9章 高级线程管理
            
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                    9.1 线程池
            
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                    9.2 中断线程
            
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                    9.3 本章总结
            
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        <li class="chapter " data-level="1.17" data-path="10.0-chinese.html">
            
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                    第10章 并行算法
            
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        <li class="chapter " data-level="1.17.1" data-path="10.1-chinese.html">
            
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                    10.1 并行化标准库算法
            
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                    10.2 执行策略
            
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        <li class="chapter " data-level="1.17.3" data-path="10.3-chinese.html">
            
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                    10.3 C++标准库中的并行算法
            
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                    10.4 本章总结
            
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        <li class="chapter " data-level="1.18" data-path="../chapter11/11.0-chinese.html">
            
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                    第11章 测试和调试多线程应用
            
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        <li class="chapter " data-level="1.18.1" data-path="../chapter11/11.1-chinese.html">
            
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                    11.1 与并发相关的Bug
            
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        <li class="chapter " data-level="1.18.2" data-path="../chapter11/11.2-chinese.html">
            
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                    11.2 定位并发Bug的技巧
            
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        <li class="chapter " data-level="1.18.3" data-path="../chapter11/11.3-chinese.html">
            
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                    11.3 本章总结
            
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        <li class="chapter " data-level="1.19" data-path="../appendix_A/A.0-chinese.html">
            
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                    附录A C++11特性简明参考(部分)
            
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        <li class="chapter " data-level="1.19.1" data-path="../appendix_A/A.1-chinese.html">
            
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                    A.1 右值引用
            
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        <li class="chapter " data-level="1.19.2" data-path="../appendix_A/A.2-chinese.html">
            
                <a href="../appendix_A/A.2-chinese.html">
            
                    
                    A.2 删除函数
            
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        <li class="chapter " data-level="1.19.3" data-path="../appendix_A/A.3-chinese.html">
            
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                    A.3 默认函数
            
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        <li class="chapter " data-level="1.19.4" data-path="../appendix_A/A.4-chinese.html">
            
                <a href="../appendix_A/A.4-chinese.html">
            
                    
                    A.4 常量表达式函数
            
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        <li class="chapter " data-level="1.19.5" data-path="../appendix_A/A.5-chinese.html">
            
                <a href="../appendix_A/A.5-chinese.html">
            
                    
                    A.5 Lambda函数
            
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        <li class="chapter " data-level="1.19.6" data-path="../appendix_A/A.6-chinese.html">
            
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                    A.6 变参模板
            
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        <li class="chapter " data-level="1.19.7" data-path="../appendix_A/A.7-chinese.html">
            
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                    A.7 自动推导变量类型
            
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        <li class="chapter " data-level="1.19.8" data-path="../appendix_A/A.8-chinese.html">
            
                <a href="../appendix_A/A.8-chinese.html">
            
                    
                    A.8 线程本地变量
            
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        <li class="chapter " data-level="1.19.9" data-path="../appendix_A/A.9-chinese.html">
            
                <a href="../appendix_A/A.9-chinese.html">
            
                    
                    A.9 模板类参数的推导
            
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        <li class="chapter " data-level="1.19.10" data-path="../appendix_A/A.10-chinese.html">
            
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                    A.10 本章总结
            
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        <li class="chapter " data-level="1.20" data-path="../appendix_B/B.0-chinese.html">
            
                <a href="../appendix_B/B.0-chinese.html">
            
                    
                    附录B 并发库简要对比
            
                </a>
            

            
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                    附录C 消息传递框架与完整的ATM示例
            
                </a>
            

            
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        <li class="chapter " data-level="1.22" data-path="../appendix_D/D.0-chinese.html">
            
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                    附录D C++线程类库参考
            
                </a>
            

            
            <ul class="articles">
                
    
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                    D.1 chrono头文件
            
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                    D.2 condition_variable头文件
            
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                    D.3 atomic头文件
            
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                    D.4 future头文件
            
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                    D.5 mutex头文件
            
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                    D.6 ratio头文件
            
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                    D.7 thread头文件
            
                </a>
            

            
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        <a href="../.." >10.2 执行策略</a>
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                                <section class="normal markdown-section">
                                
                                <h1 id="102-&#x6267;&#x884C;&#x7B56;&#x7565;">10.2 &#x6267;&#x884C;&#x7B56;&#x7565;</h1>
<p>&#x4E09;&#x4E2A;&#x6807;&#x51C6;&#x6267;&#x884C;&#x7B56;&#x7565;&#xFF1A;</p>
<ul>
<li>std::execution::sequenced_policy</li>
<li>std::execution::parallel_policy</li>
<li>std::execution::parallel_unsequenced_policy</li>
</ul>
<p>&#x8FD9;&#x4E9B;&#x7C7B;&#x90FD;&#x5B9A;&#x4E49;&#x5728;<code>&lt;execution&gt;</code>&#x5934;&#x6587;&#x4EF6;&#x4E2D;&#x3002;&#x8FD9;&#x4E2A;&#x5934;&#x6587;&#x4EF6;&#x4E2D;&#x4E5F;&#x5B9A;&#x4E49;&#x4E86;&#x4E09;&#x4E2A;&#x76F8;&#x5173;&#x7684;&#x7B56;&#x7565;&#x5BF9;&#x8C61;&#x53EF;&#x4EE5;&#x4F20;&#x9012;&#x5230;&#x7B97;&#x6CD5;&#x4E2D;&#xFF1A;</p>
<ul>
<li>std::execution::seq</li>
<li>std::execution::par</li>
<li>std::execution::par_unseq</li>
</ul>
<p>&#x9664;&#x4E86;&#x590D;&#x5236;&#x8FD9;&#x4E09;&#x79CD;&#x7C7B;&#x578B;&#x7684;&#x5BF9;&#x8C61;&#x5916;&#xFF0C;&#x4E0D;&#x80FD;&#x4EE5;&#x81EA;&#x5DF1;&#x7684;&#x65B9;&#x5F0F;&#x5BF9;&#x6267;&#x884C;&#x7B56;&#x7565;&#x5BF9;&#x8C61;&#x8FDB;&#x884C;&#x6784;&#x9020;&#xFF0C;&#x56E0;&#x4E3A;&#x5B83;&#x4EEC;&#x6709;&#x4E00;&#x4E9B;&#x7279;&#x6B8A;&#x7684;&#x521D;&#x59CB;&#x5316;&#x8981;&#x6C42;&#x3002;&#x5B9E;&#x73B0;&#x8FD8;&#x4F1A;&#x5B9A;&#x4E49;&#x4E00;&#x4E9B;&#x5176;&#x4ED6;&#x7684;&#x6267;&#x884C;&#x7B56;&#x7565;&#xFF0C;&#x5F00;&#x53D1;&#x8005;&#x4E0D;&#x80FD;&#x81EA;&#x5B9A;&#x4E49;&#x6267;&#x884C;&#x7B56;&#x7565;&#x3002;</p>
<p>&#x6267;&#x884C;&#x7B56;&#x7565;&#x5BF9;&#x7B97;&#x6CD5;&#x884C;&#x4E3A;&#x7684;&#x5F71;&#x54CD;&#x53EF;&#x89C1;10.2.1&#x8282;&#x3002;&#x4EFB;&#x4F55;&#x7ED9;&#x5B9A;&#x7684;&#x5B9E;&#x73B0;&#x90FD;&#x53EF;&#x4EE5;&#x5141;&#x8BB8;&#x6DFB;&#x52A0;&#x6267;&#x884C;&#x7B56;&#x7565;&#xFF0C;&#x4E0D;&#x7BA1;&#x4ED6;&#x4EEC;&#x9700;&#x8981;&#x600E;&#x6837;&#x7684;&#x8BED;&#x4E49;&#x3002;&#x6765;&#x770B;&#x4E00;&#x4E2A;&#x4F7F;&#x7528;&#x6807;&#x51C6;&#x6267;&#x884C;&#x7B56;&#x7565;&#x7B97;&#x6CD5;&#x7684;&#x5F71;&#x54CD;&#xFF0C;&#x5C31;&#x4ECE;&#x6240;&#x6709;&#x91CD;&#x8F7D;&#x5F02;&#x5E38;&#x7B56;&#x7565;&#x7684;&#x7B97;&#x6CD5;&#x5F00;&#x59CB;&#x5427;&#x3002;</p>
<h2 id="1021-&#x4F7F;&#x7528;&#x6267;&#x884C;&#x7B56;&#x7565;&#x7684;&#x5F71;&#x54CD;">10.2.1 &#x4F7F;&#x7528;&#x6267;&#x884C;&#x7B56;&#x7565;&#x7684;&#x5F71;&#x54CD;</h2>
<p>&#x5C06;&#x6267;&#x884C;&#x7B56;&#x7565;&#x4F20;&#x9012;&#x7ED9;&#x6807;&#x51C6;&#x7B97;&#x6CD5;&#x5E93;&#x4E2D;&#x7684;&#x7B97;&#x6CD5;&#xFF0C;&#x7B97;&#x6CD5;&#x7684;&#x884C;&#x4E3A;&#x5C31;&#x7531;&#x6267;&#x884C;&#x7B56;&#x7565;&#x63A7;&#x5236;&#x3002;&#x8FD9;&#x4F1A;&#x6709;&#x51E0;&#x65B9;&#x9762;&#x7684;&#x5F71;&#x54CD;&#xFF1A;</p>
<ul>
<li>&#x7B97;&#x6CD5;&#x590D;&#x6742;&#x5EA6;</li>
<li>&#x629B;&#x51FA;&#x5F02;&#x5E38;&#x65F6;&#x7684;&#x884C;&#x4E3A;</li>
<li>&#x7B97;&#x6CD5;&#x6267;&#x884C;&#x7684;&#x4F4D;&#x7F6E;&#x3001;&#x65B9;&#x5F0F;&#x548C;&#x65F6;&#x95F4;</li>
</ul>
<p><strong>&#x4F1A;&#x8BA9;&#x7B97;&#x6CD5;&#x66F4;&#x590D;&#x6742;</strong></p>
<p>&#x7B97;&#x6CD5;&#x63D0;&#x4F9B;&#x6267;&#x884C;&#x7B56;&#x7565;&#x65F6;&#xFF0C;&#x7B97;&#x6CD5;&#x7684;&#x590D;&#x6742;&#x5EA6;&#x5C31;&#x4F1A;&#x53D1;&#x751F;&#x53D8;&#x5316;&#xFF1A;&#x9664;&#x4E86;&#x5BF9;&#x5E76;&#x884C;&#x7684;&#x7BA1;&#x7406;&#x8C03;&#x5EA6;&#x5F00;&#x9500;&#x5916;&#xFF0C;&#x5E76;&#x884C;&#x7B97;&#x6CD5;&#x7684;&#x6838;&#x5FC3;&#x64CD;&#x4F5C;&#x5C06;&#x4F1A;&#x591A;&#x6B21;&#x6267;&#x884C;(&#x4EA4;&#x6362;&#xFF0C;&#x6BD4;&#x8F83;&#xFF0C;&#x4EE5;&#x53CA;&#x63D0;&#x4F9B;&#x7684;&#x51FD;&#x6570;&#x5BF9;&#x8C61;)&#xFF0C;&#x76EE;&#x7684;&#x662F;&#x5728;&#x603B;&#x8FD0;&#x884C;&#x65F6;&#x95F4;&#x65B9;&#x9762;&#x63D0;&#x4F9B;&#x6027;&#x80FD;&#x7684;&#x6539;&#x8FDB;&#x3002;</p>
<p>&#x590D;&#x6742;&#x5EA6;&#x7684;&#x53D8;&#x5316;&#x4F1A;&#x6839;&#x636E;&#x6BCF;&#x4E2A;&#x7B97;&#x6CD5;&#x7684;&#x4E0D;&#x540C;&#x6709;&#x6240;&#x53D8;&#x5316;&#xFF0C;&#x4E0D;&#x8FC7;&#x901A;&#x5E38;&#x7684;&#x7B56;&#x7565;&#x4F1A;&#x5C06;&#x7B97;&#x6CD5;&#x964D;&#x4F4E;&#x5230;&#x67D0;&#x4E2A;O(&#x8868;&#x8FBE;&#x5F0F;)&#x3002;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;&#x5E26;&#x6709;&#x6267;&#x884C;&#x7B56;&#x7565;&#x7684;&#x91CD;&#x8F7D;&#x6267;&#x884C;&#x7684;&#x64CD;&#x4F5C;&#x6570;&#xFF0C;&#x53EF;&#x80FD;&#x662F;&#x6CA1;&#x6709;&#x6267;&#x884C;&#x7B56;&#x7565;&#x7684;&#x6570;&#x500D;&#xFF0C;&#x8FD9;&#x4E2A;&#x500D;&#x6570;&#x53D6;&#x51B3;&#x4E8E;&#x5E93;&#x5B9E;&#x73B0;&#x548C;&#x5E73;&#x53F0;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x4F20;&#x9012;&#x7ED9;&#x7B97;&#x6CD5;&#x7684;&#x6570;&#x636E;&#x3002;</p>
<p><strong>&#x5F02;&#x5E38;&#x884C;&#x4E3A;</strong></p>
<p>&#x5177;&#x6709;&#x6267;&#x884C;&#x7B56;&#x7565;&#x7684;&#x7B97;&#x6CD5;&#x5728;&#x6267;&#x884C;&#x671F;&#x95F4;&#x89E6;&#x53D1;&#x5F02;&#x5E38;&#xFF0C;&#x5219;&#x7ED3;&#x679C;&#x53C8;&#x6267;&#x884C;&#x7B56;&#x7565;&#x786E;&#x5B9A;&#x3002;&#x5982;&#x679C;&#x6709;&#x5F02;&#x5E38;&#x672A;&#x6355;&#x83B7;&#xFF0C;&#x6807;&#x51C6;&#x6267;&#x884C;&#x7B56;&#x7565;&#x90FD;&#x4F1A;&#x8C03;&#x7528;<code>std::terminate</code>&#x3002;&#x5982;&#x679C;&#x6807;&#x51C6;&#x5E93;&#x65E0;&#x6CD5;&#x63D0;&#x4F9B;&#x7ED9;&#x5185;&#x90E8;&#x64CD;&#x4F5C;&#x8DB3;&#x591F;&#x7684;&#x8D44;&#x6E90;&#xFF0C;&#x5219;&#x5728;&#x65E0;&#x6267;&#x884C;&#x7B56;&#x7565;&#x7B97;&#x6CD5;&#x6267;&#x884C;&#x65F6;&#xFF0C;&#x4F1A;&#x89E6;&#x53D1;<code>std::bad_alloc</code>&#x5F02;&#x5E38;&#x3002;&#x4F8B;&#x5982;&#xFF1A;&#x6CA1;&#x6709;&#x6267;&#x884C;&#x7B56;&#x7565;&#x7684;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x5BF9;<code>std::for_each</code>&#x7684;&#x8C03;&#x7528;&#x4F1A;&#x5C06;&#x5F02;&#x5E38;&#x8FDB;&#x884C;&#x4F20;&#x64AD;&#x3002;</p>
<pre><code class="lang-c++"><span class="hljs-built_in">std</span>::for_each(v.begin(),v.end(),[](<span class="hljs-keyword">auto</span> x){ <span class="hljs-keyword">throw</span> my_exception(); });
</code></pre>
<p>&#x5177;&#x6709;&#x6267;&#x884C;&#x7B56;&#x7565;&#x7684;&#x8C03;&#x7528;&#xFF0C;&#x5C06;&#x7EC8;&#x6B62;&#x7A0B;&#x5E8F;&#xFF1A;</p>
<pre><code class="lang-c++"><span class="hljs-built_in">std</span>::for_each(
  <span class="hljs-built_in">std</span>::execution::seq,v.begin(),v.end(),
  [](<span class="hljs-keyword">auto</span> x){ <span class="hljs-keyword">throw</span> my_exception(); });
</code></pre>
<p>&#x8FD9;&#x5C31;&#x662F;&#x4F7F;&#x7528;<code>std::execution::seq</code>&#x6267;&#x884C;&#x7B56;&#x7565;&#x548C;&#x4E0D;&#x540C;&#x6267;&#x884C;&#x7B56;&#x7565;&#x95F4;&#x7684;&#x533A;&#x522B;&#x3002;</p>
<p><strong>&#x7B97;&#x6CD5;&#x6267;&#x884C;&#x7684;&#x4F4D;&#x7F6E;&#x548C;&#x65F6;&#x95F4;</strong></p>
<p>&#x8FD9;&#x662F;&#x6267;&#x884C;&#x7B56;&#x7565;&#x7684;&#x57FA;&#x672C;&#x9762;&#xFF0C;&#x4E5F;&#x662F;&#x6807;&#x51C6;&#x6267;&#x884C;&#x7B56;&#x7565;&#x4E4B;&#x95F4;&#x4E0D;&#x540C;&#x7684;&#x5730;&#x65B9;&#x3002;&#x76F8;&#x5E94;&#x6267;&#x884C;&#x7B56;&#x7565;&#x6307;&#x5B9A;&#x4F7F;&#x7528;&#x90A3;&#x4E9B;&#x4EE3;&#x7406;&#x6765;&#x6267;&#x884C;&#x7B97;&#x6CD5;&#xFF0C;&#x65E0;&#x8BBA;&#x8FD9;&#x4E9B;&#x4EE3;&#x7406;&#x662F;&#x201C;&#x666E;&#x901A;&#x201D;&#x7EBF;&#x7A0B;&#x3001;&#x5411;&#x91CF;&#x6D41;&#x3001;GPU&#x7EBF;&#x7A0B;&#xFF0C;&#x8FD8;&#x662F;&#x5176;&#x4ED6;&#x7684;&#x4EC0;&#x4E48;&#x3002;&#x6267;&#x884C;&#x7B56;&#x7565;&#x8FD8;&#x5C06;&#x5BF9;&#x7B97;&#x6CD5;&#x6B65;&#x9AA4;&#x8FDB;&#x884C;&#x6267;&#x884C;&#x65F6;&#x7684;&#x7EA6;&#x675F;&#x548C;&#x5B89;&#x6392;&#xFF1A;&#x662F;&#x5426;&#x4EE5;&#x7279;&#x5B9A;&#x7684;&#x987A;&#x5E8F;&#x8FD0;&#x884C;&#xFF0C;&#x7B97;&#x6CD5;&#x6B65;&#x9AA4;&#x4E4B;&#x95F4;&#x662F;&#x5426;&#x53EF;&#x4EE5;&#x4EA4;&#x9519;&#xFF0C;&#x6216;&#x5F7C;&#x6B64;&#x5E76;&#x884C;&#x8FD0;&#x884C;&#x7B49;&#x3002;</p>
<p>&#x6BCF;&#x4E2A;&#x6267;&#x884C;&#x7B56;&#x7565;&#x90FD;&#x4F1A;&#x5728;&#x4E0B;&#x9762;&#x8FDB;&#x884C;&#x8BE6;&#x89E3;&#xFF0C;&#x5148;&#x4ECE;&#x6700;&#x57FA;&#x672C;&#x7684;<code>std::execution::sequenced_policy</code>&#x5F00;&#x59CB;&#x3002;</p>
<h2 id="1022-stdexecutionsequencedpolicy">10.2.2 std::execution::sequenced_policy</h2>
<p>&#x987A;&#x5E8F;&#x7B56;&#x7565;&#x5E76;&#x4E0D;&#x662F;&#x5E76;&#x884C;&#x7B56;&#x7565;&#xFF1A;&#x5B83;&#x4F7F;&#x7528;&#x5F3A;&#x5236;&#x7684;&#x65B9;&#x5F0F;&#x5B9E;&#x73B0;&#xFF0C;&#x5728;&#x6267;&#x884C;&#x7EBF;&#x7A0B;&#x4E0A;&#x51FD;&#x6570;&#x7684;&#x6240;&#x6709;&#x64CD;&#x4F5C;&#x3002;&#x4F46;&#x5B83;&#x4ECD;&#x7136;&#x662F;&#x4E00;&#x4E2A;&#x6267;&#x884C;&#x7B56;&#x7565;&#xFF0C;&#x56E0;&#x6B64;&#x5BF9;&#x7B97;&#x6CD5;&#x7684;&#x590D;&#x6742;&#x6027;&#x548C;&#x5F02;&#x5E38;&#x5F71;&#x54CD;&#x4E0E;&#x5176;&#x4ED6;&#x6807;&#x51C6;&#x6267;&#x884C;&#x7B56;&#x7565;&#x76F8;&#x540C;&#x3002;</p>
<p>&#x8FD9;&#x4E0D;&#x4EC5;&#x9700;&#x8981;&#x5728;&#x540C;&#x4E00;&#x7EBF;&#x7A0B;&#x4E0A;&#x6267;&#x884C;&#x6240;&#x6709;&#x64CD;&#x4F5C;&#xFF0C;&#x800C;&#x4E14;&#x5FC5;&#x987B;&#x6309;&#x7167;&#x4E00;&#x5B9A;&#x7684;&#x987A;&#x5E8F;&#x8FDB;&#x884C;&#x6267;&#x884C;&#xFF0C;&#x8FD9;&#x6837;&#x6B65;&#x9AA4;&#x95F4;&#x5C31;&#x4E0D;&#x4F1A;&#x6709;&#x4EA4;&#x9519;&#x3002;&#x5177;&#x4F53;&#x7684;&#x987A;&#x5E8F;&#x662F;&#x672A;&#x6307;&#x5B9A;&#x7684;&#xFF0C;&#x5E76;&#x4E14;&#x5BF9;&#x51FD;&#x6570;&#x7684;&#x4E0D;&#x540C;&#x8C03;&#x7528;&#x4E5F;&#x662F;&#x4E0D;&#x5B58;&#x5728;&#x7684;&#x3002;&#x5C24;&#x5176;&#x662F;&#x5728;&#x6CA1;&#x6709;&#x6267;&#x884C;&#x7B56;&#x7565;&#x7684;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x4E0D;&#x80FD;&#x4FDD;&#x8BC1;&#x51FD;&#x6570;&#x7684;&#x6267;&#x884C;&#x987A;&#x5E8F;&#x4E0E;&#x76F8;&#x5E94;&#x7684;&#x91CD;&#x8F7D;&#x6267;&#x884C;&#x987A;&#x5E8F;&#x76F8;&#x540C;&#x3002;&#x4F8B;&#x5982;&#xFF1A;&#x4E0B;&#x9762;&#x5BF9;<code>std::for_each</code>&#x7684;&#x8C03;&#x7528;&#xFF0C;&#x662F;&#x5C06;1~1000&#x586B;&#x5145;&#x5230;vector&#x4E2D;&#xFF0C;&#x8FD9;&#x91CC;&#x6CA1;&#x6709;&#x6307;&#x5B9A;&#x586B;&#x5145;&#x7684;&#x987A;&#x5E8F;&#x3002;&#x8FD9;&#x5C31;&#x4E0E;&#x6CA1;&#x6709;&#x6267;&#x884C;&#x7B56;&#x7565;&#x7684;&#x91CD;&#x8F7D;&#x4E0D;&#x540C;&#xFF0C;&#x6267;&#x884C;&#x7B56;&#x7565;&#x5C31;&#x8981;&#x6309;&#x987A;&#x5E8F;&#x5BF9;&#x6570;&#x5B57;&#x8FDB;&#x884C;&#x5B58;&#x50A8;&#xFF1A;</p>
<pre><code class="lang-c++"><span class="hljs-built_in">std</span>::<span class="hljs-built_in">vector</span>&lt;<span class="hljs-keyword">int</span>&gt; v(<span class="hljs-number">1000</span>);
<span class="hljs-keyword">int</span> count=<span class="hljs-number">0</span>;
<span class="hljs-built_in">std</span>::for_each(<span class="hljs-built_in">std</span>::execution::seq,v.begin(),v.end(),
  [&amp;](<span class="hljs-keyword">int</span>&amp; x){ x=++count; });
</code></pre>
<p>&#x4E0D;&#x80FD;&#x4EC5;&#x4F9D;&#x8D56;&#x8FD9;&#x79CD;&#x65B9;&#x5F0F;&#xFF0C;&#x8BA9;&#x6570;&#x5B57;&#x6309;&#x987A;&#x5E8F;&#x8FDB;&#x884C;&#x5B58;&#x50A8;&#x3002;</p>
<p>&#x4E5F;&#x5C31;&#x662F;&#x987A;&#x5E8F;&#x7B56;&#x7565;&#x5BF9;&#x7B97;&#x6CD5;&#x4F7F;&#x7528;&#x7684;&#x8FED;&#x4EE3;&#x5668;&#x3001;&#x76F8;&#x5173;&#x503C;&#x548C;&#x53EF;&#x8C03;&#x7528;&#x5BF9;&#x8C61;&#x6CA1;&#x4EC0;&#x4E48;&#x8981;&#x6C42;&#xFF1A;&#x53EF;&#x4EE5;&#x81EA;&#x7531;&#x7684;&#x4F7F;&#x7528;&#x540C;&#x6B65;&#x673A;&#x5236;&#xFF0C;&#x5E76;&#x4E14;&#x53EF;&#x4EE5;&#x4F9D;&#x8D56;&#x4E8E;&#x540C;&#x4E00;&#x7EBF;&#x7A0B;&#x4E0A;&#x7684;&#x6240;&#x6709;&#x64CD;&#x4F5C;&#xFF0C;&#x4E0D;&#x8FC7;&#x4E0D;&#x80FD;&#x4F9D;&#x8D56;&#x8FD9;&#x4E9B;&#x64CD;&#x4F5C;&#x7684;&#x987A;&#x5E8F;&#x3002;</p>
<h2 id="1023--stdexecutionparallelpolicy">10.2.3  std::execution::parallel_policy</h2>
<p>&#x5E76;&#x884C;&#x7B56;&#x7565;&#x63D0;&#x4F9B;&#x4E86;&#x5728;&#x591A;&#x7EBF;&#x7A0B;&#x4E0B;&#x8FD0;&#x884C;&#x7684;&#x7B97;&#x6CD5;&#x7248;&#x672C;&#x3002;&#x64CD;&#x4F5C;&#x53EF;&#x4EE5;&#x5728;&#x8C03;&#x7528;&#x7B97;&#x6CD5;&#x7684;&#x7EBF;&#x7A0B;&#x4E0A;&#x6267;&#x884C;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x5728;&#x5E93;&#x521B;&#x5EFA;&#x7684;&#x7EBF;&#x7A0B;&#x4E0A;&#x6267;&#x884C;&#x3002;&#x5728;&#x7ED9;&#x5B9A;&#x7EBF;&#x7A0B;&#x4E0A;&#x6267;&#x884C;&#x9700;&#x8981;&#x6309;&#x7167;&#x4E00;&#x5B9A;&#x7684;&#x987A;&#x5E8F;&#xFF0C;&#x4E0D;&#x80FD;&#x4EA4;&#x9519;&#x6267;&#x884C;&#xFF0C;&#x4F46;&#x5341;&#x5206;&#x5177;&#x4F53;&#x7684;&#x987A;&#x5E8F;&#x662F;&#x4E0D;&#x6307;&#x5B9A;&#x7684;&#x3002;&#x5E76;&#x4E14;&#x5728;&#x4E0D;&#x540C;&#x7684;&#x51FD;&#x6570;&#x8C03;&#x7528;&#x95F4;&#xFF0C;&#x6307;&#x5B9A;&#x7684;&#x987A;&#x5E8F;&#x53EF;&#x80FD;&#x4F1A;&#x4E0D;&#x540C;&#x3002;&#x7ED9;&#x5B9A;&#x7684;&#x64CD;&#x4F5C;&#x5C06;&#x5728;&#x6574;&#x4E2A;&#x6301;&#x7EED;&#x65F6;&#x95F4;&#x5185;&#xFF0C;&#x5728;&#x56FA;&#x5B9A;&#x7EBF;&#x7A0B;&#x4E0A;&#x6267;&#x884C;&#x3002;</p>
<p>&#x8FD9;&#x5C31;&#x5BF9;&#x7B97;&#x6CD5;&#x6240;&#x4F7F;&#x7528;&#x7684;&#x8FED;&#x4EE3;&#x5668;&#x3001;&#x76F8;&#x5173;&#x503C;&#x548C;&#x53EF;&#x8C03;&#x7528;&#x5BF9;&#x8C61;&#x6709;&#x4E86;&#x989D;&#x5916;&#x7684;&#x8981;&#x6C42;&#xFF1A;&#x60F3;&#x8981;&#x5E76;&#x884C;&#x8C03;&#x7528;&#xFF0C;&#x4ED6;&#x4EEC;&#x95F4;&#x5C31;&#x4E0D;&#x80FD;&#x6709;&#x6570;&#x636E;&#x7ADE;&#x4E89;&#xFF0C;&#x4E5F;&#x4E0D;&#x80FD;&#x4F9D;&#x8D56;&#x4E8E;&#x7EBF;&#x7A0B;&#x4E0A;&#x8FD0;&#x884C;&#x7684;&#x5176;&#x4ED6;&#x64CD;&#x4F5C;&#xFF0C;&#x6216;&#x4F9D;&#x8D56;&#x7684;&#x64CD;&#x4F5C;&#x4E0D;&#x80FD;&#x5728;&#x540C;&#x4E00;&#x7EBF;&#x7A0B;&#x4E0A;&#x3002;</p>
<p>&#x5927;&#x591A;&#x6570;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x5E76;&#x884C;&#x6267;&#x884C;&#x7B56;&#x7565;&#xFF0C;&#x8FD9;&#x6837;&#x4F1A;&#x4F7F;&#x7528;&#x5230;&#x6CA1;&#x6709;&#x6267;&#x884C;&#x7B56;&#x7565;&#x7684;&#x6807;&#x51C6;&#x5E93;&#x7B97;&#x6CD5;&#x3002;&#x53EA;&#x6709;&#x5728;&#x5143;&#x7D20;&#x95F4;&#x6709;&#x7279;&#x5B9A;&#x7684;&#x987A;&#x5E8F;&#xFF0C;&#x6216;&#x8005;&#x5BF9;&#x5171;&#x4EAB;&#x6570;&#x636E;&#x6709;&#x975E;&#x540C;&#x6B65;&#x8BBF;&#x95EE;&#x65F6;&#xFF0C;&#x624D;&#x4F1A;&#x51FA;&#x73B0;&#x95EE;&#x9898;&#x3002;&#x5C06;vector&#x4E2D;&#x7684;&#x6240;&#x6709;&#x6570;&#x90FD;&#x52A0;&#x4E0A;&#x540C;&#x4E00;&#x4E2A;&#x503C;&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x5E76;&#x884C;&#xFF1A;</p>
<pre><code class="lang-c++"><span class="hljs-built_in">std</span>::for_each(<span class="hljs-built_in">std</span>::execution::par,v.begin(),v.end(),[](<span class="hljs-keyword">auto</span>&amp; x){++x;});
</code></pre>
<p>&#x82E5;&#x4F7F;&#x7528;&#x5E76;&#x884C;&#x7B56;&#x7565;&#x586B;&#x5145;&#x4E00;&#x4E2A;vector&#x4E2D;&#xFF0C;&#x90A3;&#x8FD9;&#x4E2A;&#x4F8B;&#x5B50;&#x80AF;&#x5B9A;&#x6709;&#x95EE;&#x9898;&#x3002;&#x5177;&#x4F53;&#x7684;&#x8BB2;&#xFF0C;&#x8FD9;&#x6837;&#x4F1A;&#x51FA;&#x73B0;&#x672A;&#x5B9A;&#x4E49;&#x884C;&#x4E3A;&#xFF1A;</p>
<pre><code class="lang-c++"><span class="hljs-built_in">std</span>::for_each(<span class="hljs-built_in">std</span>::execution::par,v.begin(),v.end(),
  [&amp;](<span class="hljs-keyword">int</span>&amp; x){ x=++count; });
</code></pre>
<p>&#x6BCF;&#x6B21;&#x8C03;&#x7528;Lambda&#x8868;&#x8FBE;&#x5F0F;&#x65F6;&#xFF0C;&#x90FD;&#x4F1A;&#x5BF9;&#x8BA1;&#x6570;&#x5668;&#x8FDB;&#x884C;&#x4FEE;&#x6539;&#xFF0C;&#x5982;&#x679C;&#x6709;&#x591A;&#x4E2A;&#x7EBF;&#x7A0B;&#x5728;&#x6267;&#x884C;Lambda&#x8868;&#x8FBE;&#x5F0F;&#xFF0C;&#x5C31;&#x4F1A;&#x51FA;&#x73B0;&#x6570;&#x636E;&#x7ADE;&#x4E89;&#xFF0C;&#x4ECE;&#x800C;&#x5BFC;&#x81F4;&#x672A;&#x5B9A;&#x4E49;&#x884C;&#x4E3A;&#x3002;<code>std::execution::parallel_policy</code>&#x8981;&#x6C42;&#x4F18;&#x5148;&#x8003;&#x8651;&#x8FD9;&#x4E00;&#x70B9;&#xFF1A;&#x5373;&#x4F7F;&#x5E93;&#x6CA1;&#x6709;&#x4F7F;&#x7528;&#x591A;&#x7EBF;&#x7A0B;&#xFF0C;&#x4E4B;&#x524D;&#x7684;&#x8C03;&#x7528;&#x4F9D;&#x65E7;&#x4F1A;&#x4EA7;&#x751F;&#x672A;&#x5B9A;&#x4E49;&#x884C;&#x4E3A;&#x3002;&#x5BF9;&#x8C61;&#x662F;&#x5426;&#x51FA;&#x73B0;&#x672A;&#x5B9A;&#x4E49;&#x662F;&#x8C03;&#x7528;&#x7684;&#x9759;&#x6001;&#x5C5E;&#x6027;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x4F9D;&#x8D56;&#x5E93;&#x5B9E;&#x73B0;&#x7684;&#x7EC6;&#x8282;&#x3002;&#x4E0D;&#x8FC7;&#xFF0C;&#x8FD9;&#x91CC;&#x5141;&#x8BB8;&#x5728;&#x51FD;&#x6570;&#x8C03;&#x7528;&#x95F4;&#x8FDB;&#x884C;&#x540C;&#x6B65;&#xFF0C;&#x56E0;&#x6B64;&#x53EF;&#x4EE5;&#x5C06;count&#x8BBE;&#x7F6E;&#x4E3A;<code>std::atomic&lt;int&gt;</code>&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x4EC5;&#x7528;&#x7B80;&#x5355;int&#x6765;&#x8868;&#x793A;&#xFF0C;&#x6216;&#x662F;&#x4F7F;&#x7528;&#x4E92;&#x65A5;&#x91CF;&#x3002;&#x8FD9;&#x79CD;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x53EF;&#x80FD;&#x4F1A;&#x7834;&#x574F;&#x4F7F;&#x7528;&#x5E76;&#x884C;&#x6267;&#x884C;&#x7B56;&#x7565;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x56E0;&#x6B64;&#x8FD9;&#x91CC;&#x5C06;&#x5BF9;&#x6240;&#x6709;&#x64CD;&#x4F5C;&#x8FDB;&#x884C;&#x5E8F;&#x5217;&#x5316;&#x8C03;&#x7528;&#x3002;&#x901A;&#x5E38;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x4F1A;&#x5141;&#x8BB8;&#x5BF9;&#x5171;&#x4EAB;&#x72B6;&#x6001;&#x7684;&#x540C;&#x6B65;&#x8BBF;&#x95EE;&#x3002;</p>
<h2 id="1024-stdexecutionparallelunsequencedpolicy">10.2.4 std::execution::parallel_unsequenced_policy</h2>
<p>&#x5E76;&#x884C;&#x4E0D;&#x6392;&#x5E8F;&#x7B56;&#x7565;&#x63D0;&#x4F9B;&#x4E86;&#x6700;&#x5927;&#x7A0B;&#x5EA6;&#x7684;&#x5E76;&#x884C;&#x5316;&#x7B97;&#x6CD5;&#xFF0C;&#x7528;&#x4EE5;&#x5F97;&#x5230;&#x5BF9;&#x7B97;&#x6CD5;&#x4F7F;&#x7528;&#x7684;&#x8FED;&#x4EE3;&#x5668;&#x3001;&#x76F8;&#x5173;&#x503C;&#x548C;&#x53EF;&#x8C03;&#x7528;&#x5BF9;&#x8C61;&#x3002;</p>
<p>&#x4F7F;&#x7528;&#x5E76;&#x884C;&#x4E0D;&#x6392;&#x5E8F;&#x7B56;&#x7565;&#x8C03;&#x7528;&#x7684;&#x7B97;&#x6CD5;&#xFF0C;&#x53EF;&#x4EE5;&#x5728;&#x4EFB;&#x610F;&#x7EBF;&#x7A0B;&#x4E0A;&#x6267;&#x884C;&#xFF0C;&#x8FD9;&#x4E9B;&#x7EBF;&#x7A0B;&#x5F7C;&#x6B64;&#x95F4;&#x6CA1;&#x6709;&#x987A;&#x5E8F;&#x3002;&#x4E5F;&#x5C31;&#x662F;&#x5728;&#x5355;&#x7EBF;&#x7A0B;&#x4E0A;&#x4E5F;&#x53EF;&#x4EE5;&#x4EA4;&#x53C9;&#x8FD0;&#x884C;&#xFF0C;&#x8FD9;&#x6837;&#x5728;&#x7B2C;&#x4E00;&#x4E2A;&#x7EBF;&#x7A0B;&#x5B8C;&#x6210;&#x524D;&#xFF0C;&#x7B2C;&#x4E8C;&#x4E2A;&#x64CD;&#x4F5C;&#x4F1A;&#x5728;&#x540C;&#x4E00;&#x4E2A;&#x7EBF;&#x7A0B;&#x4E0A;&#x542F;&#x52A8;&#xFF0C;&#x5E76;&#x4E14;&#x64CD;&#x4F5C;&#x53EF;&#x4EE5;&#x5728;&#x7EBF;&#x7A0B;&#x95F4;&#x8FC1;&#x79FB;&#xFF0C;&#x56E0;&#x6B64;&#x7ED9;&#x5B9A;&#x7684;&#x64CD;&#x4F5C;&#x53EF;&#x4EE5;&#x5728;&#x4E00;&#x4E2A;&#x7EBF;&#x7A0B;&#x4E0A;&#x542F;&#x52A8;&#xFF0C;&#x5728;&#x53E6;&#x4E00;&#x4E2A;&#x7EBF;&#x7A0B;&#x4E0A;&#x8FD0;&#x884C;&#xFF0C;&#x5E76;&#x5728;&#x7B2C;&#x4E09;&#x4E2A;&#x7EBF;&#x7A0B;&#x4E0A;&#x5B8C;&#x6210;&#x3002;</p>
<p>&#x4F7F;&#x7528;&#x5E76;&#x884C;&#x4E0D;&#x6392;&#x5E8F;&#x7B56;&#x7565;&#x65F6;&#xFF0C;&#x7B97;&#x6CD5;&#x4F7F;&#x7528;&#x7684;&#x8FED;&#x4EE3;&#x5668;&#x3001;&#x76F8;&#x5173;&#x503C;&#x548C;&#x53EF;&#x8C03;&#x7528;&#x5BF9;&#x8C61;&#x4E0D;&#x80FD;&#x4F7F;&#x7528;&#x4EFB;&#x4F55;&#x5F62;&#x5F0F;&#x7684;&#x540C;&#x6B65;&#xFF0C;&#x4E5F;&#x4E0D;&#x80FD;&#x8C03;&#x7528;&#x4EFB;&#x4F55;&#x9700;&#x8981;&#x540C;&#x6B65;&#x7684;&#x51FD;&#x6570;&#x3002;</p>
<p>&#x4E5F;&#x5C31;&#x662F;&#xFF0C;&#x5FC5;&#x987B;&#x5BF9;&#x76F8;&#x5173;&#x7684;&#x5143;&#x7D20;&#x6216;&#x57FA;&#x4E8E;&#x8BE5;&#x5143;&#x7D20;&#x53EF;&#x4EE5;&#x8BBF;&#x95EE;&#x7684;&#x6570;&#x636E;&#x8FDB;&#x884C;&#x64CD;&#x4F5C;&#xFF0C;&#x5E76;&#x4E14;&#x4E0D;&#x80FD;&#x4FEE;&#x6539;&#x7EBF;&#x7A0B;&#x4E4B;&#x95F4;&#x6216;&#x5143;&#x7D20;&#x4E4B;&#x95F4;&#x5171;&#x4EAB;&#x7684;&#x72B6;&#x6001;&#x3002;</p>
<p>&#x7A0D;&#x540E;&#x6211;&#x4EEC;&#x5C06;&#x7528;&#x4E00;&#x4E9B;&#x4F8B;&#x5B50;&#x6765;&#x586B;&#x5145;&#x8FD9;&#x4E9B;&#x5185;&#x5BB9;&#x3002;&#x73B0;&#x5728;&#xFF0C;&#x8BA9;&#x6211;&#x4EEC;&#x6765;&#x770B;&#x770B;&#x7B97;&#x6CD5;&#x672C;&#x8EAB;&#x3002;</p>

                                
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